JavaScript HTML5 Charts Comparison

We recently needed a HTML5 JavaScript Chart for our small project. but we need base features such as zoom and pan. After we searched some time, we found the zoom and pan were the painful for JavaScript visualization libraries.  We spent long time to make decision which one was the one we needed. maybe we finally have to buy a commercial chart.

However, during we searching, we found Dennis Krusko had a nice post on his blog about Comparison of JavaScript Data Visualization Libraries, which could save you lots of time to learn different features.